Abstract
Calibration and use of the diffusion porometer are imprecise because of imperfect understanding of steady diffusion through a porous material. The case of a flat plate with uniformly distributed right circular cylindrical holes is approximated by diffusion through two finite right circular cylinders: one representing the pore, and one representing the area into which vapor diffuses — its size determined by the mutual interference with neighboring pores. An exact three-dimensional solution is presented. It is found that for large pore spacing the empirical result of Holcomb and Cooke is excellent, but for close pore spacing some error occurs. A method for calculation of true calibration plate resistance is described as well as a method for estimating pore size for an unknown plate or membrane.
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